TERKESTRIAL MAGNETISM. 



25 



Dip. 



^ 6 

 & q 



Epoch of 

 commencing 

 vibration, 

 hrs. min. sec. 



Duration 

 of 500 

 vibra- 

 tions. 



as 



H S 



Calculated 

 duration 

 at 60°. 



Square of the 

 preceding. 



Horizon- 

 tal inten- 

 sity. 



Total in- 

 tensity: 

 hor. being 

 1000. 



Total inten- 

 sity : that at 

 Cincinnati 

 = 1000. 



205. Loadstone Encampment.— Lat. — ° — ' N. Long. 87" 44' W. July 27, 1847. 



42° 53' 00" 



5 



10 16 00 



822.00 60 



822.00 



65963284 



2766.0 1261.6 





206. East Branch of the Esconawby.— Lat. 46° 24' N. Long. 87° 47' W. July 28 



1847. 



76° 14' 21" 



4 



9 41 01 A 



1304.3 



62 



1304.13 17007550569 728.36 3062.6 



1023.6 



207. Falls of East Branch of Esconawby.— July 29, 1847. 



76° 39' 00" 



5 



7 58 08 A 



1601.4 



60 



1601.4 



25644819600 715.39 3098.3 



1035.5 



208. Train River.— Lat. 46° 30' N. Long. 87° 01' W. August 7, 1847. 



76° 41' 37" 



5 



6 52 32 A 



1593.63 



55 



1594.18 25414098724 717.95 3118.7 



1042.4 



209. Grand Island.— Lat. 46° 27' N. Long. 86° 45' W. August 8, 1847. 



76° 37' 52" 



5 



7 01 03 



1589.2 



64 



1583.76 



25241383376 722.86 



312.18 



1045.1 



210. Chapel River.— Lat. 46° 43' N. Long. 86° 40' W. August 11, 1847. 



77° 11' 30" 



5 



5 37 02 



1618.3 



62 



1618.08 



26181828864 



696.98 



3143.7 



1050.7 



211. At the Cave of Portal Rock, about three-quarters of a mile to the north-west of the 

 preceding. August 11, 1847. 



77° 12' 48" 



5 



9 48 02.4 



1621.61 



64 



1621.16 



26281597456 



694.27 



3139.8 



1049.4 



212. Grand Marais, East Point.— Lat. 46° 42' N. Long. 86° 09' W. August 12, 1847. 



77° 18' 03" 



5 



8 57 04 A 



1631 



64.5 



1630.5 



26574216256 



686.61 3123.2 



1043.6 



205. Loadstone Encampment.— Range 26, township 47, section 18. Geology : a loadstone in place, 

 broken mostly into sharp angular fragments. Here were two poles, 17.67 feet apart, one attracting the 

 north and the other the south pole of a magnetic needle. (See notes.) 



206. East Branch of the Esconawby. — Range 26, township 46, section 6. Geology : probably sienite. 



207. Falls of East Branch of Esconawby.— Range 26, township 46, section 30. Geology : porphyritic 

 sienite. 



208. Train River. — Range 20, township 47, section 32. 



209. Grand Island. — Range 19, township 47, section 22, at the point west of Williams's. 



210. Chapel River. — Range 18, township 48, section 35. 



211. At the Cave of Portal Rock. — Geology: horizontal sandstone. 



212. Grand Marais, East Point. — Range 13, township 49, section 4. 

 7 



